<?php
namespace addons\venue\library;


use think\Config;

class WxRefunt
{
    protected $SSLCERT_PATH ='';//证书
    protected $SSLKEY_PATH = '';//证书
    protected $opUserId = '';//商户号
    protected $key = '';//API密钥
    protected $appId = '';//appId
    function __construct($outTradeNo, $totalFee, $outRefundNo, $refundFee)
    {
        //初始化退款类需要的变量
        $config = get_addon_config('venue');
        $this->appId = $config['appid'];
        $this->opUserId = $config['secret'];
        $this->key = $config['mch_id'];
        $this->totalFee = $totalFee;//订单金额
        $this->refundFee = $refundFee;//退款金额
        $this->outTradeNo = $outTradeNo;//订单号
        $this->outRefundNo = $outRefundNo;//退款订单
    }
    /**
     * 通过微信api进行退款流程 唯一对外接口
     * @return string
     */
    public function refundApi()
    {
        $parma = array(
            'appid' =>  $this->appId,
            'mch_id' =>  $this->opUserId,
            'nonce_str' =>  $this->createNoncestr(),
            'out_refund_no' =>  $this->outRefundNo,
            'out_trade_no' =>  $this->outTradeNo,
            'total_fee' =>  intval($this->totalFee * 100),
            'refund_fee' =>  intval($this->refundFee * 100),
            'notify_url' =>  "https://motion.51meteor.com/addons/epay/api/refund_notifyx/type/wechat",
        );
        $parma['sign'] = $this->getSign($parma, $this->key);
        $xmldata = $this->arrayToXml($parma);
        $xmlresult = $this->postXmlSSLCurl($xmldata, 'https://api.mch.weixin.qq.com/secapi/pay/refund');
        $result = $this->arrayToXml($xmlresult);
        return $result;
    }
    /**
     * 数组转xml
     * @param $arr
     * @return string
     */
    protected function arrayToXml($arr)
    {
        $xml = "<xml ";
        foreach ($arr as $key =>  $val) {
            if (is_numeric($val)) {
                $xml .= "<" . $key . " " . $val . "</" . $key . " ";
            } else {
                $xml .= "<" . $key . " <![CDATA[" . $val . "]] </" . $key . " ";
            }
        }
        $xml .= "</xml ";
        return $xml;
    }
    /**
     * 签名加密
     * @param $params
     * @param $key
     */
    protected function getSign($params, $key)
    {
        ksort($params, SORT_STRING);
        $unSignParaString = $this->formatQueryParaMap($params, false);
        return $signStr = strtoupper(md5($unSignParaString . "&key=" . $key));
    }
    /**
     * 排序
     * @param $paraMap
     * @param bool $urlEncode
     * @return bool|string
     */
    protected function formatQueryParaMap($paraMap, $urlEncode = false)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
        if (null != $v && "null" != $v) {
            if ($urlEncode) {
                $v = urlencode($v);
            }
            $buff .= $k . "=" . $v . "&";
        }
    }
    $reqPar = '';
    if (strlen($buff)>0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
    return $reqPar;
}
    /**
     * 需要使用证书的请求
     * @param $xml
     * @param $url
     * @param int $second
     * @return bool|mixed
     */
    protected function postXmlSSLCurl($xml, $url, $second = 30)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        curl_setopt($ch, CURLOPT_SSLCERTTYPE, 'PEM');
        curl_setopt($ch, CURLOPT_SSLCERT, $this->SSLCERT_PATH);
        curl_setopt($ch, CURLOPT_SSLKEYTYPE, 'PEM');
        curl_setopt($ch, CURLOPT_SSLKEY, $this->SSLKEY_PATH);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        $data = curl_exec($ch);
        if ($data) {
            curl_close($ch);
            return $data;
        } else {
            $error = curl_errno($ch);
            echo "curl出错，错误码:$error" . "<br ";
            curl_close($ch);
            return false;
        }
    }
    /*
 * 生成随机字符串方法
 */
    protected function createNoncestr($length = 32 ){
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str ="";
        for ( $i = 0; $i < $length; $i++ ) {
            $str.= substr($chars, mt_rand(0, strlen($chars)-1), 1);
        }
        return $str;
    }
}